Ambipolar host in organic light emitting diode
a light-emitting diode and ambipolar host technology, applied in the direction of discharge tube luminescnet screen, other domestic articles, natural mineral layered products, etc., can solve the problems of unbalanced hole-transport and electron-transport properties, aggregation and lack of uniformity, and uneven material degradation ra
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example 1
[0100]An example of the host compound may be synthesized according to the following scheme:
[0101]
Experimental
[0102]Bromo-Py-Cbz (1). Compound 1 was made according to a procedure adapted from Hou, Z.; Liu, Y.; Nishiura, M.; Wang, Y. J. Am. Chem. Soc. 2006, 128(17), 5592-5593. A mixture of carbazole (4.751 g, 28.41 mmol), 3,5-dibromopyridine (20.19 g, 85.23 mmol), K2CO3 (15.71 g, 113.6 mmol), copper powder (1.204 g, 18.94 mmol), 18-crown-6 ether (2.503 g, 9.470 mmol) and 1,2-dichlorobenzene (150 mL) was degassed with argon for 1 h while stirring. The reaction mixture was then maintained at 200° C. with stirring under argon for 20 h. Upon cooling to RT, the crude mixture was filtered and concentrated in vacuo. The resulting residue was then purified by flash chromatography (SiO2, 1:1 to 11:9 dichloromethane-hexanes) to afford 1 (6.75 g, 74%) as a white solid: mp=118-120° C.; 1H NMR (400 MHz, CDCl3): δ 8.81 (dd, J=23.2, 2.0 Hz, 2H), 8.14 (d, J=7.7 Hz, 2H), 8.10 (t, J=2.2 Hz, 1H), 7.47-7...
example 2
[0105]Fabrication of Device C: ITO coated glass substrates were cleaned by ultrasound in acetone and 2-propanol, consecutively, then baked at 110° C. for 3 hours, followed by treatment with oxygen plasma for 5 min. A layer of PEDOT: PSS (Baytron P from H. C. Starck) was spin-coated at 3000 rpm onto the pre-cleaned and O2-plasma treated (ITO)-substrate and annealed at 180° C. for 10 min, yielding a thickness of around 40 nm. In a glove-box hosted vacuum deposition system at a pressure of 10−7 torr (1 torr=133.322 Pa), 4,4′4″-tri(N-carbazolyl)triphenylamine (TCTA) was first deposited on top of PEDOT / PSS layer at deposition rate of 0.06 nm / s, yielding a 30 nm thick film. Then Dicbz-Bipy and platinum(II)(2-(4′,6′-difluorophenyl)pyridinato-N,C2′)(2,4-pentanedionato) (FPt) were concurrently heated and deposited on top of TCTA under different deposition speed to make FPt at 12 wt %, followed by deposition of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) at deposition rate around 0.06...
example 3
[0106]The ambipolar property of Dicbz-Bipy was evaluated using Devices A and B. Device A was fabricated as following: ITO-coated glass substrates were cleaned by ultrasound in acetone and 2-propanol, consecutively, then baked at 110° C. for 3 hours, followed by treatment with oxygen plasma for 5 min. A layer of PEDOT: PSS (Baytron P from H. C. Starck) was spin-coated at 3000 rpm onto the pre-cleaned and O2-plasma treated (ITO)-substrate and annealed at 180° C. for 10 min, yielding a thickness of around 40 nm. In a glove-box hosted vacuum deposition system at a pressure of 10−7 torr (1 torr=133.322 Pa) was Dicbz-Bipy first deposited on top of PEDOT / PSS layer at deposition rate of 0.06 nm / s, followed by deposition of Al at deposition rates of 0.2 nm / s.
[0107]Device B was fabricated as following: ITO-coated glass substrates were cleaned by ultrasound in acetone and 2-propanol, consecutively, then baked at 110° C. for 3 hours, followed by treatment with oxygen plasma for 5 min. In a glov...
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